Por venir or para venir is one way. Venidero/a is another way. If you mean it's the next attraction in an ongoing series of attractions, such as movies, then Próximo/a conveys the notion that its the next one after the current one.
ven pronto
Vuelva pronto.
Regrese a nosotros pronto.
pronto
Proximo
come soon
pronto!Pronto.
come soon in marathi
Escribe pronto.
Dear We say..........."chheti vaapas aa jao" for "come back soon" in punjabi.
Te quero pronto
Estar enseguida. Or... Ser pronto.
come to is venir, and Come is Ven